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CAS 1120-21-4

CAS 1120-21-4 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 1120-21-4
CAS 1120-21-4PubChem CID 14257

Undecane

Undecane is a straight-chain alkane with 11 carbon atoms. — ChEBI

IUPAC name
undecane
Molecular formula
C11H24
Molecular weight
156.31 g/mol
Exact mass
156.187800766 Da
XLogP3
5.6
Topological polar surface area
0.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
0
Covalent units
1
Defined stereocentres
0

Also known as

N-UNDECANEHendecaneJV0QT00NUENSC-66159CHEBI:46342RefChem:6337214-300-6n-Hendecane
16 more reported names
Decane, methyl-Undecane, >=99%n-Undecane; HendecaneCCRIS 3796EINECS 214-300-6UNII-JV0QT00NUENSC 66159UN2330BRN 1697099undecanHendekanUndekanAI3-21126Undecane, 99%Undecane [UN2330] [Flammable liquid]UNDECANE, N-
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

NIH PubChem PUG-View
Exact identifier match14257

Attributed physical-property, hazard, environmental and use annotations.

  • First Aid: EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.; SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment.; INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) shou Source: CAMEO Chemicals
  • ERG2024, Guide 128 (Undecane): General First Aid:; · Call 911 or emergency medical service.; · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination.; · Move victim to fresh air if it can be done safely.; · Administer oxygen if breathing is difficult.; · If victim is not breathing:; -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance.; -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped with a one-way valve or other device).; -- If no pulse detected or no respiratory medical device available, provide continuous compressions. Conduct a pulse check every two minutes or monitor for any signs of spontaneous respirations.; · Remove and isolate contaminated clothing and shoes.; · For minor skin contact, avoid spreading material on unaffected skin.; · In case of contact with substance, remove immediately by flushing skin or eyes with running water for at least 20 minutes.; · For severe burns, immediate medical attention is required.; · Effects of exposure (inhalation, ingestion, Source: Emergency Response Guidebook (ERG)
  • Note: This chemical does not meet GHS hazard criteria for 0.8% (4 of 486) of reports. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H304 (99%): May be fatal if swallowed and enters airways [Danger Aspiration hazard] Source: European Chemicals Agency (ECHA)
  • Precautionary Statement Codes: P301+P316, P331, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
  • ECHA C&L Notifications Summary: Aggregated GHS information provided per 486 reports by companies from 14 notifications to the ECHA C&L Inventory.; Reported as not meeting GHS hazard criteria per 4 of 486 reports by companies.; There are 13 notifications provided by 482 of 486 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: NITE-CMC
  • GHS Hazard Statements: H226: Flammable liquid and vapor [Warning Flammable liquids]; H304: May be fatal if swallowed and enters airways [Danger Aspiration hazard]; H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation] Source: NITE-CMC
  • Precautionary Statement Codes: P210, P233, P240, P241, P242, P243, P261, P271, P280, P301+P316, P303+P361+P353, P304+P340, P319, P331, P370+P378, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement) Source: NITE-CMC
  • Signal: Danger Source: Hazardous Substances Data Bank (HSDB)
  • GHS Hazard Statements: H227: Combustible liquid [Warning Flammable liquids]; H304: May be fatal if swallowed and enters airways [Danger Aspiration hazard] Source: Hazardous Substances Data Bank (HSDB)
  • Precautionary Statement Codes: P210, P280, P301+P316, P331, P370+P378, P403, P405, and P501 (click each P-code to see the statement) Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Health Rating: 1 - Materials that, under emergency conditions, can cause significant irritation. Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Fire Rating: 2 - Materials that must be moderately heated or exposed to relatively high ambient temperatures before ignition can occur. Materials would not under normal conditions form hazardous atmospheres with air, but under high ambient temperatures or under moderate heating could release vapor in sufficient quantities to produce hazardous atmospheres with air. Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Instability Rating: 0 - Materials that in themselves are normally stable, even under fire conditions. Source: Hazardous Substances Data Bank (HSDB)
  • Toxicity Summary: IDENTIFICATION AND USE: Undecane is a colorless liquid. It is used in petroleum research, organic synthesis, and as distillation chaser. It is also a component of gasoline. HUMAN EXPOSURE AND TOXICITY: In tests with human subjects, solutions as strong as 30% produced no irritation when applied to skin and left for 24 hr. Exposure to undecane during industrial use causes eye and skin irritation. It is irritating to mucous membranes and the upper respiratory tract. ANIMAL STUDIES: In skin irritation tests in which these substances were applied to the skin of rabbits tetradecane was observed to have the strongest effect, followed by heptadecane, dodecane, and undecane in that order. Undecane was shown to have tumor promoting activity. Undecane (25 mg) and benzo(a)pyrene (BP) (5 ug) applied to the skin of female mice, 3 times per wk for 440 days, induced papillomas in 41 of 50 animals. BP alone induced tumors in 12 of 50 animals in the same time, while undecane alone did not produce tumors. Rats were given up to 1000 mg/kg/day undecane by gavage; males dosed for 46 days including 14 days prior to mating, and during the mating period; females dosed for 14 days prior to mating, during ma Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Bioconcentration: An estimated BCF of 120 was calculated in fish for n-undecane(SRC), using a estimated log Kow of 5.74(1) and a regression-derived equation(1). According to a classification scheme(2), this BCF suggests the potential for bioconcentration in aquatic organisms is high(SRC), provided the compound is not metabolized by the organism(SRC). Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 2,600(SRC), determined from a structure estimation method(2), indicates that n-undecane is expected to have slight mobility in soil(SRC). Volatilization of n-undecane from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 6.1 atm-cu m/mole(SRC), derived from its vapor pressure, 0.412 mm Hg(3), and water solubility, 0.014 mg/L(4). However, adsorption to soil is expected to attenuate volatilization(SRC). n-Undecane is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(SRC). A 118% of theoretical BOD in 4 weeks using activated sludge in the Japanese MITI test(5) suggests that biodegradation is an important environmental fate process in soil(SRC). Other screening tests have also found n-undecane to be readily biodegradable(6). A soil microcosm study using Rangeland silt loam soil determined n-undecane Theoretical oxygen demand (ThOD) values of 31.2-31.8% over a 75 hour period(7). Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 2,600(SRC), determined from a structure estimation method(2), indicates that n-undecane is expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 6.1 atm-cu m/mole(SRC), derived from its vapor pressure, 0.412 mm Hg(4), and water solubility, 0.014 mg/L(5). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 3.7 hours and 5 days, respectively(SRC). However, volatilization from water surfaces is expected to be attenuated by adsorption to suspended solids and sediment in the water column(SRC). The estimated volatilization half-life from a model pond is 1 month if adsorption is considered(6). According to a classification scheme(7), an estimated BCF of 120(SRC), from an estimated log Kow of 5.74(2) and a regression-derived equation(2), suggests the potential for bioconcentration in aquatic organisms is high(SRC). A 118% of theoretical BOD in 4 weeks using activated sludge in the Japanese MITI test(7) suggests that biodegradation is an import Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), n-undecane, which has a vapor pressure of 0.412 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase n-unedecane is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 29 hrs(SRC), calculated from its rate constant of 1.32X10-11 cu cm/molecule-sec at 25 °C(3). Based upon data for similar alkanes(4), n-undecane does not absorb at wavelengths >290 nm and, therefore, is not expected to be susceptible to direct photolysis by sunlight(SRC). Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status
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NIH PubChem PUG-ViewExact match2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 1120-21-4

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CAS 1120-21-4 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 1120-21-4 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.